fix: complete retail parity stability pass

src/AcDream.App/World/InventoryWorldDropProjectionController.cs

@@ -2,6 +2,7 @@ using AcDream.App.UI;
 using AcDream.Core.Items;
 using AcDream.Core.Net;
 using AcDream.Core.Net.Messages;
+using AcDream.Core.Selection;
 
 namespace AcDream.App.World;
 
@@ -26,6 +27,7 @@ internal sealed class InventoryWorldDropProjectionController : IDisposable
     private readonly ClientObjectTable _objects;
     private readonly LiveEntityRuntime _runtime;
     private readonly LiveEntityHydrationController _hydration;
+    private readonly SelectionState _selection;
     private readonly PendingSplitToWorldProjection _pending;
     private readonly Func<double> _now;
     private bool _disposed;
@@ -35,6 +37,7 @@ internal sealed class InventoryWorldDropProjectionController : IDisposable
         ClientObjectTable objects,
         LiveEntityRuntime runtime,
         LiveEntityHydrationController hydration,
+        SelectionState selection,
         Func<double> now)
     {
         _interaction = interaction
@@ -43,6 +46,7 @@ internal sealed class InventoryWorldDropProjectionController : IDisposable
         _runtime = runtime ?? throw new ArgumentNullException(nameof(runtime));
         _hydration = hydration
             ?? throw new ArgumentNullException(nameof(hydration));
+        _selection = selection ?? throw new ArgumentNullException(nameof(selection));
         _now = now ?? throw new ArgumentNullException(nameof(now));
         _pending = new PendingSplitToWorldProjection();
 
@@ -64,7 +68,15 @@ internal sealed class InventoryWorldDropProjectionController : IDisposable
         // Consume before the synchronous CreateObject graph runs. Re-entrant
         // callbacks cannot bind the same split intent to a second GUID.
         _hydration.OnCreate(spawn);
-        return _runtime.TryGetSnapshot(update.Guid, out _);
+        bool recovered = _runtime.TryGetSnapshot(update.Guid, out _);
+        if (recovered)
+        {
+            // ACCWeenieObject::DeclareValid @0x0058E481 transfers the one
+            // global selection to the recognized split result. This is an
+            // automatic system transition, not a synthetic inventory click.
+            _selection.Select(update.Guid, SelectionChangeSource.System);
+        }
+        return recovered;
     }
 
     public void Dispose()

src/AcDream.App/World/LiveEntityRuntime.cs

@@ -1222,7 +1222,10 @@ public sealed class LiveEntityRuntime : ILiveEntityRadarSource
         }
         if (record.FullCellId != token.ExactCellId
             || record.Canonical.PlacementCommitVersion
-                != token.PlacementCommitVersion)
+                != token.PlacementCommitVersion
+            || record.Canonical.PhysicsBody is not { } body
+            || body.Position != projection.WorldPosition
+            || body.Orientation != projection.Orientation)
         {
             // A newer move superseded this receipt's facts after the drain.
             //
@@ -1264,13 +1267,13 @@ public sealed class LiveEntityRuntime : ILiveEntityRadarSource
             // That is a behaviour change in the wrong direction, not a
             // restoration.
             //
-            // The ONE supersession neither term covers is
-            // RuntimeRemotePlacementDriveController.StoreAcceptedDestinationPose:
-            // the far-snap Refused/Contention arm writes `body.Position` and
-            // `body.Orientation` with no placement commit and no cell move, so
-            // it can stale this receipt's pose silently. That is pre-existing
-            // (it predates C5b, which changed nothing about that arm) and is
-            // filed as docs/ISSUES.md #323 rather than papered over here.
+            // #323: compare the retained body's exact pose too. The receipt
+            // copied these floats directly from that body, so exact equality
+            // is the correct proof that its pose is still current. This
+            // catches StoreAcceptedDestinationPose's legitimate pose-only
+            // fallback without abusing PositionAuthorityVersion (which can
+            // advance while the receipt facts remain unchanged) or redefining
+            // PlacementCommitVersion for a store that committed no cell.
             return true;
         }